Proportioning pump



Oct. 21, 1941. w. P. VALENTINI-2A i 2,259,713

' PRoPoRT-IoNING PUMP Filed Nov. 24, 1959 2 Sheets-Sheet l 0t- 21 1941' w. P. VALENTINE PROPORTIONING PUMP Filed Nov. 24, 1939 2 Sheets-Sheet 2 Patented Oct. 21, 1941 UNITED STATES PATENT oEEiCE I Paorosrsosigllizd PUMP Warren P. Valentine, Yeadon, Pa.

8 Claims.

The invention relates to variable capacity liq- I range of stroke adjustment of a proportional pump.

A further purpose is to provide for adjustment of the pumping capacity by a self-locking worm and worm wheel during the operation of the pump.

A further purpose is to equip a duplicate pump with separate adjustments of the pumping capacity of the individual pumps.

A further purpose is to provide a rocking link arm having uniform rocking movement with a block positively adjustable along it to vary the stroke of a pump.

A further purpose is to shift an operating sleeve on a rocking link by rack and pinion movement operated positively as through a worm and Worm gear and capable of adjustment during the pumping action.

A further purpose is to rock a curved link about a center, to adjust a pumping connection along the curved length of the link and to place the drawing pin for the pump at the center of the curvature of the link when the pump is at the innermost portion of its stroke, whereby the inward stroke ends at the same point whatever the extent of stroke.

A further purpose is to form the link guide for block adjustment as a truncated segment about pump cross head pin, when in innermost plunger position, so that the plunger will always have same inner stroke terminal, whatever the adjustment.

Further purposes will appear in the specification and in the claims.

I have illustrated the invention by a. single form only among various forms by which the invention may be shown, selecting therefor one which is practical and effective and which at the same time well illustrates the principles involved.

Figure 1 is a verticalelevation upon lines I-I of Figure 3 showing a duplex pump embodying the invention.

Figure 2 is a partial end elevation and partial section, upon line 2-2 of Figure 1, parts being removed for clearness of illustration.

Figure 3 is a top plan view of the structure of Figure 1.

Figure 4 is a fragmentary section of Figure 1 upon line 4-4. l

Figure 5 is an end elevation of Figure 4 showing parts of the stroke-adjusting mechanism.

Figure 6 is an lend elevation of the rocking link of Figure 1` Figure 'Z is an inverted perspective of a sleeve block adjustable along the link.

Figure 8 is a fragmentary section of a form applied to a double-action pump.

Iltis the drawings similar numerals indicate like par In proportional pumping of liquids it is very desirable not only to have positively pumping action but to have-the capacity of the pump positively and very exactly capable of adjustment so that it can be used to proportion the ilows of liquids one to another by variation of one or both flows and for long periods of time may reliably supply the same proportions desired of liquids pumped.

Each of the two units grouped in my illustration is an opposite counterpart of the other and each embodies the features of my invention. They are shown together for the reason that there is considerable demand for duplicate units and proportional control of two liquids together greatly increases the range of the proportioning possible.

In my pump as shown the duplicate units operate side by side from the same source of power and within the same casing but are capable not only of handling wholly separate and distinct liquids or gases but of pumping at different rate with the different pumps.

'I'he casing i0 rests on a base Il and an otherwise open end is closed by a. cover l2. All frame parts are united through suitable anges. The casing frame is connected with the pump unit frame i3. v

Within the lower part of the casing are mounted heads I4, I5 carrying bearings I6, Il for crank shaft I 6, having two cranks i9 and 20. The crank shaft is driven by shaft 2| through any suitable source of power not shown. Ordinarily this will be a direct electric motor drive or a belt or gear connection from another driving shaft.

'I'he casing carries bearings 22, 23, 24 provided with caps 25 supporting hollow rock shafts 26 and`21 and stub shafts 28 and 29. 'I'hese are all axially in line. The shafts 26 and 21 are supported respectively in the bearings 22 and 24 and the stub shafts 28 and 29 lie facing, closely adjacent, and both within the same bearing 23. Each of the shafts 26 and 21 is extended outside of the casing, at 30 or 3| for an adjusting purpose hereafter more fully explained.

As the parts of the two constructions are duplicate and the dierences between the two units are differences in opposite counterpart placing merely, it has not been considered necessary to show the detail of both constructions and the description will follow one, the same reference characters being used for corresponding Paris of vthe other where these parts appear.

Between each shaft and its cooperating stub shaft is located a link 32 comprising arc-shaped parallel straps 33 and 3l, both apertured and connected one to the shaft and the other to the stubshaft. The straps areunited at theends not shown. Plunger l' carries a double acting 1 piston Il whose inward end acts to pump through bolted spacers to hold the parts together and to maintain the spacing of the straps.

The connection between the straps comprises at one end a bolt 3i surrounded by a loose sleeve It and at the other end a strut 21 bolted to the straps at 3l and il. The shaft is rocked by a pitman Il 'having bearing upon a crank of the crank shaft at one end and upon loose sleeve It at the opposite end. s

By the above construction each link-is rocked about the shaft and stub shaft as in the familiar locomotive link reversing mechanism.

T'he straps of the link guide a block or sleeve 4| having curved grooves 42 and 4I in its side faces which cooperate with the straps of the link in guiding the block.

The block is bifurcated in cross section, as seenbestinFigure'l soastoprovide anouter convex connecting shell 44 and truncated segment sides II and 46 within which sides are formed the guiding grooves. One of the sides further carries a longitudinally curved driven rack Il, concentric in curvature with the curvature of the segment shell and grooves. Inner and outer flanges Il, 49 and il, Si form the limits of the lateral grooves.

The block is thus capable of moving along the curved length ofthe link so as to vary the throw of a pin 52 supported at both ends, one end in each of the sides Il, 4I of the block andfree at its center to be surrounded by one bearing I3 of a connecting rod il. The rod oscillates about the pin or about a sleeve 5l surrounding the pin within a space between sides 4l, 4i. The pin l2 `may nt in either of the holes l1 and 58 axially in line near one end of the block, or holes Il andl Il axially in line at the other end of the block, thus accommodating the block and pin to either of its alternative (opposite counterpart) positions.

Except as the pin is tted in one or other of when the block is used in one or other of the two (duplicate) pumps shown, the blocks are not only equalin Just as does the inward end of plunger Il and always reaches the same position, whatever the adjustment: as'does plunger I5. All of the adiustment becomes effective, therefore, in alteration of the outmost position of the outer face of the piston.

Oil inlet and waste discharge to and from gland Il are shown at Il.

Since the pumping areas of the piston are un- Flgure 8, the rates of pumping of the piston will be unequal in opposite strokes. Different fluids can be pumped by the two strokes;

zol

v the two pairs of openings 51 and l2 or Il and ll, A

opposite counterparts in the two pumps. but are exact duplicates. Each connecting rod 'M extends from its pin l2 to a bearing Il about crosshead pin l2 in crosshead travelling in guides Il supported in the casing. Y

With the crosshead is connected a plunger piston $5 which is shown as threaded into the crosshead at II and locked there by nut $1. '111e piston operates through two glands Il and Il, one protecting the driving mechanism against injury by leakage into it of liquid pumped and the other protecting against leakage from the pump chamber 1I of the pump. The pumps illustrated are intended to be typical of pumps for such purposes, there being many pumps available which are suitable. In the single action pump of Figure 1 there are shown inlet and outlet valves 'il and 12 limited in their opening stroke at 13 and not shown, is applied to prevent leakage.

In Figure 8 gland il' protects from leakage. t

'Ihe pump is double acting and plugs l2 act through springs I4 to hold outlet valves |12 normally against their seats. The inlet valves are and this ls true particularly where the two fluids are to be mingled ultimately, so that slight leakase ofone into the other becomes immaterial.

The length of the connecting rod 54 is such that pin\ l2 lies at the center of the curvature of the link and block when the plunger is in its innermost stroke position (i. e. when the link has rocked to its farthest counterclockwise position in Figure 1). No change takes place in the innermost position of the plunger with adjustment of the block si and no matter what the position of adjustment the inner end of the plunger stroke is the'same. 'I'his position is shown for the link l2', block 4I and connecting rod Il' in Figure 1, the radius being shown as R.

Each block is moved positively along its link to adjust by a pinion Il engaging with rack Il. The pinion is keyed upon a shaft 9i which has bearing within the hollow shaft 26 or 21vconnested rigidly with one of the link side plates, in Figure 6 with link plate 23, and is supported through bearing 22 -and the frame.

Within the bearing is shown a friction-reducing sleeve l2.

Upon the outer end Il of the shaft 9| is keyed Y at II a worm wheel 8| with which meshes a worm il, seenin Figures 2, 3, 4 and 5. The worm is keyed to a shaft Il, turning in' bearings il and :handheld by collars 92 and |00 and set screws The bearings Il and Il are carried by the bracket Il2 mounted upon a reduced end of hollow shaft 2B- or '21. It oscillates with the shaft. Y

. Shaft I0 is extended to receive an adjusting wheel, not shown, so that the shaft may be rotated by hand to turn the worm and, through the worm wheel, correspondingly to turn the pinion and adjust the position of the block along the arc length of the corresponding link. 'Ihe position of the adjusted block with respect to any standard position is shown by an indicator III in connectionwith a marking Ill upon plate Ill. 'Ihe plate is supported by the bracket bearinss for the shaft It. It will be noted that the use of the worm and worm wheel maintains the adjustment as made.

The rocking range of each link is set by the throw of its crank and is uniform because there is no adjustment for the spacing between the pin 30 and the axis of the hollow link shaft about which axis the rocking takes place. 'I'he entire adilutment therefore is made by movement of the block along the arcuate length of the link.

The permissive range of adjustment of the block extends from the limit of the movement of the section block to the left in Figure 1 approximately as shown in that figure, to a position in which the axis of pin l2 coincides with and then passes the axis of the link shaft. In other words,

adjustment of the stroke can be made from the* position shown, not only to zero throw position but past that position to reverse throw on the op.- posite side of the zero.

The worm and worm wheel adjustment provides for adjustment at minute increments and exact adjustment with respect to predetermined standards. Moreover, the wheel by which the adjustment is accomplished, though it rocks with.

the shaft, can be grasped and turned by the hand of the attendant during the operation of the Pllmlh In view of my invention and disclosure variations and modifications to meet'individual whim or particular need will doubtless becomeevident to others skilled in the art, to obtain part or all of the benets of my invention without copying the structure shownand I, therefore, claim all such in so far as they fall within the reasonable spirit and scope of my invention.

Having thus described my invention what I claiirins as new and desire to secure by Letters Paten 1. In a proportioning pump, a longitudinally curved rocking link, crank means for rocking the link, hollow shaftsupport for the link, a block adjustable along the length of thelink, a pump having a piston rod, a. connecting rod operating the piston rod from the block and block adjustingy means rocking with the link and operating through the hollow shaft.

2. In a proportioning pump. a driving shaft, a longitudinally curved link, a hollow link shaft about whose axis the link is adapted to oscillate, a driving shaft and connections by which the link is rocked, a block having curved guiding connection with the link, whereby it is adjustable along the curved length of the link, a pump having a piston rod, connections between the block and the piston rod, a rack within the block, a pinion engaging the rack, a. pinion shaft carrying the pinion and passing through the hollow link shaft, and self-locking means connecting with the pinion shaft for turning the pinion and thus moving' the rack, a pinion carried by the shaft and engaging the rack, a support for the shaft rocking with the link and block and shaft-turning means, outside of the shaft support, for turning the shaft and pinion and locking them in turned position,

whereby the position of the block along the length of the link is adjusted and the block is retained in adjusted position. i

5. In a proportioning pump,l a longitudinally curved rocking link, crank means for rocking the link about an axis between the ends of the link,

shaft support for the link, a.block adjustable along the length of the link to' a point opposite the rocking axis, a pump having a piston rod, a v

.ing position or to pumping positions having throws diiferent for different distances of block position from the axis.

the rack to adjust the position of the block along the link length.

3. In a proportioning pump, a hollow link shaft, a link carried by the shaft, bearings for the shaft, pitman-operated rocking means for the link, an adjusting block movable along the curved length of the link, a pump having a piston rod, driving connections between the block and the piston rod whereby adjustment of the block along the length `of the link varies the stroke of the piston rod, a rack carried by the block, a pinion engaging the rack, a pinion shaft driving the pinion and operating through the hollow shaft, and worm wheel and worm adjusting means for turning the pinion shaft.

4. In a. proportioning pump, a longitudinally curved link comprising spaced curved straps and connections between the straps, having a transverse pin at one end of the link, pitman driving connections for the link engaging the pin, a block having opposite curved grooves receiving and guided by the straps of the link. bifurcated to provide a connecting rod space between the sides, a pin across the space terminating at its two ends in opposite sides of the block, a connecting rod' engaging the pin at one rod end, a pump operated by the other end of the connecting rod, a rack carried by one of the sides of the block within itsgroove, a shaft terminating opposite 6. In a proportioning pump, a driving shaft. a link rockedl by the driving shaft, having longitudinally curved inner and outer contours, thel rocking taking -place about. -an axis between the' ends of the curved length .of the link, a block adjustablealong the curved length of the link, means for adjusting the block, a pin carried by the block, a pump piston rod, a guided crosshead for the piston rod, a crosshead pin, and a connecting rod between the crosshead pinand the block pin, the extent of rocking of the link and pump having a piston rod, crosshead and crosshead pin, a longitudinally curved link, a shaft and bearings for supporting the link, a. pitman between the crank andthe link, in one extreme crank position `shifting the link to a position where the curvedlink lies about the crosshead pin as a center, -a block adjustablealong the curved length of the link, and curved rack and pinion means for adjusting and retaining the adjustment of the block along the curved length of the link.

8. In a proportioning pump, a longitudinally curved link, hollow shaft and bearing means for supporting the link and permitting rocking movement of the link, a pin at the end of the link, crank and pitman means for engaging the pin to rock the link, a pump having a piston rod and crosshead, a crosshead pin, the crosshead pin lying at the center of curvature of the link 'at the innermost pump piston part of the stroke, a blockv adjustable along the curvedlength of the link, a pin in the block, 'a connecting rod between the block pin and the crosshead pin, Acurved guides between lthe block and the link, a curved rack within a groove in one side of the block, an adjusting shaft passing through the hollow of the link shaft, a pinion upon the adjusting shaft and engaging the rack, a worm gear upon the adjusting shaft and a worm mounted to engage the worm` gear for adjusting andfholdlng the adjustment of Ithe adjusting shaft. y

WARREN P. VALENTINE. 

